Rahu and Ketu are known as aprakasha grahas, or shadow planets. Because of their shadowy nature, classical texts don’t offer detailed descriptions of their placement in the zodiac signs. Instead, they tend to take on the qualities of the rulers of the signs they’re placed in. So, it’s important to look at the condition of the sign’s ruler. If the ruler is strong, the shadow planet will also have strong influence—and if the ruler is weak, their impact will be diminished.

In Vedic astrology, Rahu is said to act like Saturn, and Ketu behaves like Mars.

Rahu is exalted in Taurus, and Ketu in Scorpio. These exalted positions can bring wealth, fame, or even mystical abilities. Rahu is also considered strong in Virgo, while Ketu is powerful in Pisces. Rahu becomes even stronger when placed in its own sign, Aquarius, and Ketu in Leo. The remaining signs are not generally seen as favorable for them.

Ultimately, the influence of Rahu and Ketu should be interpreted based on the strength of the planetary ruler of the sign they occupy.